JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Shijie Qiu,Hengwei Wei,Xiaoming Wang,Shuai Zhang,Mengmeng Wang,Yiying Wang,Ling Xu,Huan Jiao
A series of efficient red phosphors, K 2 SiF 6 :Mn 4+ (KSFM) particles with highly regular, uniform and anisotropic shapes, were successfully prepared by a two-step chemical co-precipitation method at room temperature without using surfactant and template. A morphological map for KSFM particles with five distinctive shapes was depicted by adjusting KF-HF precipitator dropping speed. Moreover, the photoluminescence , decay curves and Raman spectral dependence of the KSFM phosphors with different morphologies were investigated. Luminescence intensity of the KSFM phosphors is highly correlated with the morphology of KSFM particles, which gradually increased as the particle shapes changed from cube to octahedron . Whereas, Raman spectra and flame atomic absorption spectrophotometer results indicated that Mn 4+ concentration in a series of KSFM particles decreased gradually. Growth mechanism of particle is discussed base on reticular density and surface energy. White LED devices made of a blue GaN chip merged with yellow phosphor (YAG: Ce 3+ ) and the obtained KSFM red phosphor could produce warm white light. Drive current testing of the fabricated w-LEDs proved the KSFM phosphor in octahedron shape is more stable than that of the KSFM in cubic shape.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 12
·期 11
·2302380
·
IF 9
Xiangyi Dai,Xikun Zou,Haoran Zhang,Weibin Chen,Chaowei Yang,Maxim S. Molokeev,Zhiguo Xia,Yingliang Liu,Xuejie Zhang,Mingtao Zheng,Bingfu Lei
Cr 3+ -doped phosphors are highly recognized in various fields for their remarkable luminous efficiency and spectral flexibility, including modern agriculture and horticulture. However, the shortage of suitable Cr 3+ -doped phosphors for far-red LED devices has inhibited their popularization in plant lighting. Herein, an innovative Cr 3+ -doped phosphor Ca 2 YAl 3 Ge 2 O 12 :Cr 3+ (CYAG:Cr 3+ ), achieving a broad far-red emission at 770 nm upon 450 nm blue light excitation is designed. The optimal CYAG:Cr 3+ phosphor exhibits a high internal quantum yield of 78.2% and low thermal-quenching behavior of 85%@373 K. Thus, the fabricated phosphor-converted LEDs (pc-LEDs) for plant far-red lighting have a high output power of 33.3 mW and photovoltaic conversion efficiency of 11.5% at 100 mA. The potential of CYAG:Cr 3+ in plant lighting is assessed by supplementing the far-red lighting of Italian lettuce with fabricated pc-LEDs, and the biomass of Italian lettuce is significantly increased by 33%. The successful development of CYAG:Cr 3+ phosphors provides a high-quality option for plant far-red light devices and further stimulates the development of new Cr 3+ -doped plant-lighting phosphors.
研究领域:
材料科学
·
农业与植物学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Chaowei Yang,Dongwei Zheng,Xikun Zou,Xiangyi Dai,Baoling Tang,Maxim S. Molokeev,Xuejie Zhang,Haoran Zhang,Yingliang Liu,Bingfu Lei
Far-red (FR) region (beyond 700 nm) lighting sources possess special potential for plant lighting. However, it remains a challenge to obtain high-performance Cr 3+ -doped FR phosphors. This study developed a FR phosphor, Ca 1.8 Mg 1.2 Al 2 Ge 3 O 12 :Cr 3+ (CMAGG: Cr 3+ ), using the cation substitution strategy. Under 438 nm blue light excitation, the phosphors display FR emission centered at 720 nm with a full width at half maximum (FWHM) of 91 nm. Benefit from the favorable match with the FR phytochrome (P fr ), the phosphor is combined with InGaN blue light chips to create a FR phosphor-converted light-emitting diode (pc-LED), which is used in Italian lettuce growth experiments and it results shown in a 15% increase in fresh weight and a 6.5% increase in dry weight. Notably, supplemental FR light modulated its growth morphology. The results of this study will be useful for further research on novel Cr 3+ -doped FR phosphors to meet the precise spectral requirements for plant growth.
研究领域:
植物学
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yuan Zhong,Nan Zhou,Mao Xia,Yue Zhou,Hongxi Chen,Zhi Zhou
Indoor cultivation has attracted more and more concerns in the last few years. Searching for ideal red-emitting phosphors for this application has been a great challenge. In this paper, a novel red-emitting phosphor SrAl 3 BO 7 :Mn 4+ (SABO:Mn 4+ ) had been synthesized through a modified hydrothermal reaction method for the first time. Three kinds of effect parameters, including hydrothermal reacting time, sintering temperature and Mn 4+ doping concentration, were comprehensively considered to optimize the phase purity and luminescent properties of the SABO:Mn 4+ phosphor. Besides, the luminescent properties of SABO:Mn 4+ was systematically investigated through UV–vis absorption spectra , PLE and PL spectra, CIE chromaticity coordinate and decay times. The excitation band of this phosphor locates in the wavelength range of 250–550 nm, resulting from Mn 4+ → O 2− charge transfer and electron transitions from 4 A 2 – 4 T 1 , 2 T 2 and 4 T 2 energy levels. Meanwhile, a sharp emission band is detected from 600 to 700 nm with two emission peaks located at 648 and 662 nm, which is assigned to 2 E → 4 A 2 characteristic transition of Mn 4+ . In addition, Mg 2+ /Zn 2+ /Ca 2+ are co-doped as charge compensators to improve the luminescent properties of SABO:0.03Mn 4+ . The impacts of doping concentration of Mg 2+ /Zn 2+ /Ca 2+ on the photoluminescent intensity, QE and thermal stability of SABO:0.03Mn 4+ phosphor is investigated carefully. The corresponding mechanism is discussed via decay times, EPR spectra and configurational coordinated diagram. More importantly, the EL spectrum of as-fabricated pc-LED device matches well with the absorption of plant pigments, demonstrating this novel phosphor can regard as a promising red-emitting luminescent material to meet the light requirement in plant growth LED lighting.
研究领域:
材料科学
·
光学工程
·
植物学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Yanbin Wang,Xinyou Huang,Ziqiu Cheng,Penghui Chen,Yuyang Chen,Junhao Ye,Haohong Chen,Zhenzhen Zhou,Denis Yu Kosyanov,Jiang Li
Introducing Al 2 O 3 as a secondary phase into Ce:LuAG phosphor ceramics has been realized by solid-state reaction method, but there is much room for improvement on the ingredient uniformity and performance of Al 2 O 3 -Ce:LuAG composite phosphor ceramics (CPCs). In this work, the excess of Al 3+ in (Ce,Lu) 3 Al 5 O 12 was regulated to synthesize a series of Al 2 O 3 -Ce:LuAG multiphase powders by the co-precipitation method, and homogeneous Al 2 O 3 -Ce:LuAG CPCs (the uniform volume fraction between Al 2 O 3 and Ce:LuAG phases) were obtained by vacuum sintering (1775 °C × 10 h). With an increase in the Al 3+ content, the morphology of the multiphase powders changes from small irregular shapes to porous flocs and flakes interwoven, and Lu 3 Al 5 O 12 phases tend to convert to LuAlO 3 phases. When the Al 2 O 3 content is 78–89 mol% in the CPCs, the average grain sizes of Al 2 O 3 are close to those of Ce:LuAG. Among all CPCs with an Al 2 O 3 content of 68–95 mol%, the 85 mol% Al 2 O 3 -Ce:LuAG CPCs initially perform the best in terms of both excitation and emission intensity at room temperature, and their photoluminescence intensities only decrease 4.3% from 25 to 225 °C. A solid-state laser lighting device was constructed by using a 450 nm laser source and Al 2 O 3 -Ce:LuAG CPCs in a reflection mode. The CPCs with 85 mol% Al 2 O 3 content based on 0.9 W laser diodes (LDs) show the optimum luminous flux (LF) and luminous efficiency (LE) of 244 lm and 266 lm∙W −1 , respectively. Additionally, the LF of all CPCs based on LDs continues to increase without showing luminescence saturation when the power density increases from 1 to 20 W mm −2 . When the 85 mol% Al 2 O 3 -containing CPCs are excited by a 20 W mm −2 LD, the maximum LF reaches 3624 lm, and the LE decreases only by 12.4% (compared to the data under 1 W mm −2 excitation). Al 2 O 3 -Ce:LuAG CPCs have excellent luminescence properties and improved thermal stability, which are promising for the application in solid-state laser lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Huangjie Lu,Zhaofa Zheng,Zi-Jian Li,Hongliang Bao,Xiaojing Guo,Xiaofeng Guo,Jian Lin,Yuan Qian,Jian-Qiang Wang
Rational design and synthesis of new photochromic sensors have been active research areas of inquiry, particularly on how to predict and tailor their properties and functionalities. Herein, two thulium 2,2′:6′,2′′-terpyridine-4′-carboxylate (TPC)-functionalized metal–organic hybrids, Tm(TPC)2(HCOO)(H2O) (TmTPC-1) and Tm(TPC)(HCOO)2 (TmTPC-2) with different photochromic response behaviors, have been successfully prepared, allowing for straightforward investigations of the structure–property correlation. Single-crystal X-ray diffraction and electron paramagnetic resonance analyses revealed that the incorporation of a unique dangling decorating TPC unit in TmTPC-1 offers a shorter and more accessible π–π interaction pathway between the adjacent TPC moieties than that in TmTPC-2. Such a structural feature leads to the production of radical species via a photoinduced intermolecular electron-transfer (IeMCT) process upon UV or X-ray irradiation, which ultimately endows TmTPC-1 with a rather unusual UV and X-ray dual photochromism. A linear relationship between the change of UV–vis absorbance intensity and X-ray dose was established, making TmTPC-1 a promising dosimeter for X-ray radiation with an extremely high energy threshold (30 kGy). To advance the development for real-world application, we have fabricated polyvinylidene fluoride (PVDF) membranes incorporating TmTPC-1 for functioning either as a UV imager or as an X-ray radiation indicator. Lastly, TmTPC-1 exhibits high thermal stability (up to 400 °C) and radioresistance (at least 900 kGy), and also excellent reversibility of photochromic transformation (at least 5 cycles).
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yuqi Cui,Li-chao Nengzi,Jianfeng Gou,Yan Huang,Bo Li,Xiuwen Cheng
Z-scheme heterojunction photocatalyst can simultaneously reduce the recombination of photo-generated electron-hole pairs and preserve its outstanding redox ability during the process of photocatalytic reaction. In this study, Z-scheme MIL-53(Fe)/α-Bi 2 O 3 /g-C 3 N 4 photocatalyst was successfully fabricated via an accessible method and comprehensive characterized by XRD, FT-IR, SEM, TEM, XPS, N 2 adsorption-desorption isotherms, UV–vis diffuse reflection spectroscopy and photoelectrochemical analysis. The as-obtained MIL-53(Fe)/α-Bi 2 O 3 /g-C 3 N 4 composite exhibited superior photocatalytic activity for amino black 10B degradation than that of pure g-C 3 N 4 , α-Bi 2 O 3 , MIL-53(Fe) and α-Bi 2 O 3 /g-C 3 N 4 binary composite under visible light irradiation and the photodegradation rate would achieve the maximum when the mass fraction of MIL-53(Fe) was 32% in ternary composite. The enhanced photocatalytic performance of MIL-53(Fe)/α-Bi 2 O 3 /g-C 3 N 4 ternary composite could be mainly ascribed to improved visible light absorption range and the construction of an effective interfacial heterojunction driven by direct solid-state dual Z-scheme mechanism, which significantly facilitates the separation and transfer of photo-generated charge carriers. Eventually, the as-prepared ternary composite was confirmed to have prominent stability and reusability after consecutive 4 recycling run.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 6
·065302
·
IF 1.62
Long-Xiang Cheng,Tao Liu,Lei Li,Liu Yang,Hong-Wei He,Jun-Cheng Zhang
Practical applications of phosphor particles in light sources and displays generally require the adhesion and support of polymer materials. However, these phosphor/polymer composites suffer from the difficulty in self-repairing after fracture. Inspired by the development of self-healing polymers, herein, we prepared phosphor/polymer composite films with self-repairing and restructuring properties. The N,N-dimethylformamide dispersant was used to uniformly disperse the phosphor particles in the self-healing polymer, which is considered to the key process for obtaining self-repairing properties. The developed self-repairing composite films are particularly suitable for restructuring luminescent patterns to provide multidimensional light-emitting modes including photoluminescence, persistent luminescence and mechanoluminescence. These results are expected to provide new insights for designing multifunctional self-repairing and reconstructing composites for anti-counterfeiting, integrated optics, optical communications, and artificial skins.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2021
·
IF 3.721
Ting-Hong Huang,Cheng Luo,Dan Zheng
Cationic and neutral mononuclear Cu(I) complexes, [Cu(PPh 3 ) 2 (PmH)]BF 4 (1a), [Cu(DPEphos) (PmH)]BF 4 (2a), [Cu(Xantphos) (PmH)]BF 4 (3a), [Cu(PPh 3 ) 2 (Pm)] (1b), [Cu(DPEphos) (Pm)] (2b) and [Cu(Xantphos) (Pm)] (3b) (PPh 3 = triphenylphosphine , DPEphos = bis(2-diphenylphosphinophenyl)ether, Xantphos = 9, 9-dimethyl-bis(diphenylphosphino)xanthenes, PmH = 2-(pyridin-2-yl)benzimidazole, Pm=(2-(Pyridin-2-yl)benzimidazolate), have been prepared and characterized by IR, 1 H NMR, 13 C NMR, 31 P NMR, XRD, elemental analysis and X-ray crystal structure analysis. The structural analysis shows that each of Cu(I) complexes includes a tetrahedral [Cu(NN) (PP)] + moiety, and temperature variation from 99 K to 298 K leads to the change of bonds lengths, angles and weak interactions. Meanwhile, theoretical calculations indicate that the differences between cationic and neutral Cu(I) complexes affect the composition of HOMO and LUMO orbitals, and the effect of temperature on Mülliken atomic charges is limited. Furthermore, neutral Cu(I) complexes 1b–3b show better luminescence in comparison to cationic Cu(I) complexes 1a-3a at room temperature , and temperature variations from 99 K to 298 K result in changing photoluminescence to some extent, which partly agrees with the related calculation results. In these cationic and neutral Cu(I) complexes, the maximum phosphorescent lifetime and quantum yield reach respectively 137 μs and 42% at room temperature. Moreover, cationic and neutral Cu(I) complexes are utilized to fabricate the monochromatic LEDs, showing favorable electroluminescence with the maximum EQE of 7.10%.
研究领域:
材料化学
·
光学
·
理论计算
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2016
·
IF 4.055
Yahui Zhang,Lingwei Kong,Xiaoling Pan,Huiling Mao,Xiangkai Zeng,Jianbing Shi,Bin Tong,Yuping Dong
A multicolor switching was achieved via simple reversible coordinationand acetalation reaction between aldehydes, tri(pentafluorophenyl)borane (BCF) and methanol. The coordination [HPB → BCF] of 4,4′-[(1E,3E)-1,2,3,4-tetraphenylbuta-1,3-diene-1,4-diyl]- dibenzaldehyde ( E,E- HPB) to tri(pentafluorophenyl)borane can change the emissive wavelength from 550 to 630 nm, while transformation of the aldehyde into acetal can change the emissive wavelength from 550 to 530 nm in the presence of methanol. More important, these reactions can access reversibility easily and tune the emission color repeatedly between cyan, yellow and red. All of these dyes show typical aggregation-induced emission (AIE) or aggregation-enhanced emission (AEE) characteristics. In addition, a tunable photoluminescence mechanism is proposed based on the characterization data including NMR , XRD , MS and IR. The result may provide a new design strategy for the multicolor switches and their related applications.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2016
·Vol. 5
·期 5
·R74
·
IF 1.65
Lei Wang,Lu Feng,Chuansheng Cui,Shuling Xu,Jifeng Liu,Xiuyu Sun,Xuexi Gao,Wenjun Wang
In this work, ZnO nanorods were prepared and functionalized with two different alkanethiols. Fourier transform infrared spectra, X-ray photoelectron spectra, thermogravimetric analysis/ differential scanning calorimetry measurements and Raman spectra were applied to characterize the surface composition of functionalized ZnO nanorods. Photoluminescence spectra analyses were applied to characterize the optical properties of the functionalized ZnO nanorods. Electrochemiluminescence measurements were used to investigate the influence of surface functionalization to the surface conductivity and emission property of ZnO nanorods. The results indicated that the length of alkyl chains in the functional thiol moiety can influence the electrochemiluminescence intensity and the maximum peak position of electrochemiluminescence spectrum of functionalized ZnO nanorods, the variation of electrochemiluminescence properties can be attributed to the increase of electrical resistance of ZnO nanorods and the changes of surface states that are related to the specific hole trap sites and the shallow electron levels.
研究领域:
材料科学
·
光学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2024
·Vol. 39
·期 9
·1449-1461
·
IF 2.7
Zhang Yeheng,Lin Wensong,Gao Ran,Lin Huanxia,He Yong
One-step co-precipitation method was used to prepare the flower-like BiOCl/BiOBr composite materials (BOBCs) with heterojunction structures, in which various amounts of BiOBr were used to adjust the band gap of BiOCl and thereby improve its photocatalytic activity. Based on photocatalytic performance experiments, BOBC2, in which the molar ratio of BiOCl to BiOBr is 1:0.75, exhibited the highest photodegradation efficiency (90.5%) to remove ofloxacin after 100 min illumination. The cyclic utilization performance of BOBC2 under the same conditions was tested by a cycle experiment. It was found that its photocatalytic activity remained at a high level after three cycles. The composition and microstructure of the material were analyzed by characterization techniques including XRD, FTIR, XPS, and SEM. The optical properties and the degradation process of the material were studied by DRS, PL, photocurrent, and active species trapping methods. The reasonable mechanism for photocatalytic degradation of ofloxacin was proposed. Graphical abstract
研究领域:
材料科学
·
环境科学
·
化学工程
·
纳米技术
·
光催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）